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Answer:
Basically, when it comes to conducting heat, not all substances are created equal. Metals and stone are considered good conductors since they can speedily transfer heat, whereas materials like wood, paper, air, leads, non metal and cloth are poor conductors of heat.
Metals like copper and aluminium have the highest thermal conductivity while steel and bronze have the lowest. As copper is an excellent conductor of heat, it is good for heat exchanger also. Gold, Silver, Iron etc are also some examples of good heat conductors as well as electrical conductors.
Explanation:
A conductor heats up fast along its volume, thickness or width when heat source (like a flame) is applied at one point on it. Heat is spread fast and its temperature at other surface rises when one surface is heated. Capacity to conduct heat this way can differ among different conductors.
Heat is an interesting form of energy. Not only does it sustain life, make us comfortable and help us prepare our food, but understanding its properties is key to many fields of scientific research. For example, knowing how heat is transferred and the degree to which different materials can exchange thermal energy governs everything from building heaters and understanding seasonal change to sending ships into space.
Heat can only be transferred through three means: conduction, convection and radiation. Of these, conduction is perhaps the most common, and occurs regularly in nature. In short, it is the transfer of heat through physical contact. It occurs when you press your hand onto a window pane, when you place a pot of water on an active element, and when you place an iron in the fire.